gvpe/src/connection.h

/*
    connection.h -- header for connection.C
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef VPE_CONNECTION_H__
#define VPE_CONNECTION_H__

#include <openssl/hmac.h>

#include "global.h"
#include "conf.h"
#include "sockinfo.h"
#include "util.h"
#include "device.h"

struct vpn;

// called after HUP etc. to (re-)initialize global data structures
void connection_init ();

struct rsaid {
  u8 id[RSA_IDLEN]; // the challenge id
};

typedef u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data;
typedef u8 rsaencrdata[RSA_KEYLEN]; // encrypted challenge
typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash

////////////////////////////////////////////////////////////////////////////////////////

struct crypto_ctx;

struct hmac_packet:net_packet
{
  u8 hmac[HMACLENGTH];          // each and every packet has a hmac field, but that is not (yet) checked everywhere

  void hmac_set (crypto_ctx * ctx);
  bool hmac_chk (crypto_ctx * ctx);

private:
  static unsigned char hmac_digest[EVP_MAX_MD_SIZE];

  void hmac_gen (crypto_ctx * ctx);
};

struct vpn_packet : hmac_packet
  {
    enum ptype
    {
      PT_RESET = 0,
      PT_DATA_UNCOMPRESSED,
      PT_DATA_COMPRESSED,
      PT_PING, PT_PONG, // wasting namespace space? ;)
      PT_AUTH_REQ,      // authentification request
      PT_AUTH_RES,      // authentification response
      PT_CONNECT_REQ,   // want other host to contact me
      PT_CONNECT_INFO,  // request connection to some node
      PT_MAX
    };

    u8 type;
    u8 srcdst, src1, dst1;

    void set_hdr (ptype type_, unsigned int dst);

    unsigned int src () const
    {
      return src1 | ((srcdst >> 4) << 8);
    }

    unsigned int dst () const
    {
      return dst1 | ((srcdst & 0xf) << 8);
    }

    ptype typ () const
    {
      return (ptype) type;
    }
  };

////////////////////////////////////////////////////////////////////////////////////////

// a very simple fifo pkt-queue
class pkt_queue
  {
    net_packet *queue[QUEUEDEPTH];
    int i, j;

  public:

    void put (net_packet *p);
    net_packet *get ();

    pkt_queue ();
    ~pkt_queue ();
  };

struct connection
  {
    conf_node *conf;
    struct vpn *vpn;

    sockinfo si; // the current(!) destination ip to send packets to
    int retry_cnt;

    tstamp last_activity;       // time of last packet received

    u32 oseqno;
    sliding_window iseqno;

    u8 protocol;

    pkt_queue data_queue, vpn_queue;

    crypto_ctx *octx, *ictx;

    enum conf_node::connectmode connectmode;
    u8 prot_minor; // minor number of other side

    void reset_si ();
    const sockinfo &forward_si (const sockinfo &si) const;

    void shutdown ();
    void connection_established ();
    void reset_connection ();

    void establish_connection_cb (time_watcher &w); time_watcher establish_connection;
    void rekey_cb (time_watcher &w); time_watcher rekey; // next rekying (actually current reset + reestablishing)
    void keepalive_cb (time_watcher &w); time_watcher keepalive; // next keepalive probe

    void send_connect_request (int id);
    void send_auth_request (const sockinfo &si, bool initiate);
    void send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg);
    void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols);
    void send_reset (const sockinfo &dsi);
    void send_ping (const sockinfo &dsi, u8 pong = 0);
    void send_data_packet (tap_packet *pkt);

    void inject_data_packet (tap_packet *pkt, bool broadcast = false);
    void inject_vpn_packet (vpn_packet *pkt, int tos = 0); // for forwarding

    void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = 0);
    void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi);

    void script_node ();
    const char *script_node_up ();
    const char *script_node_down ();

    void dump_status ();

    connection(struct vpn *vpn_);
    ~connection ();
  };

#endif

Revision:	1.9
Committed:	Thu Oct 16 02:28:36 2003 UTC (20 years, 7 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.8:	+1 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			connection.h -- header for connection.C
3
4			This program is free software; you can redistribute it and/or modify
5			it under the terms of the GNU General Public License as published by
6			the Free Software Foundation; either version 2 of the License, or
7			(at your option) any later version.
8
9			This program is distributed in the hope that it will be useful,
10			but WITHOUT ANY WARRANTY; without even the implied warranty of
11			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12			GNU General Public License for more details.
13
14			You should have received a copy of the GNU General Public License
15			along with this program; if not, write to the Free Software
16			Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17			*/
18
19			#ifndef VPE_CONNECTION_H__
20			#define VPE_CONNECTION_H__
21
22			#include <openssl/hmac.h>
23
24			#include "global.h"
25			#include "conf.h"
26			#include "sockinfo.h"
27			#include "util.h"
28			#include "device.h"
29
30			struct vpn;
31
32			// called after HUP etc. to (re-)initialize global data structures
33			void connection_init ();
34
35			struct rsaid {
36			u8 id[RSA_IDLEN]; // the challenge id
37			};
38
39			typedef u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data;
40			typedef u8 rsaencrdata[RSA_KEYLEN]; // encrypted challenge
41			typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash
42
43			////////////////////////////////////////////////////////////////////////////////////////
44
45			struct crypto_ctx;
46
47			struct hmac_packet:net_packet
48			{
49			u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere
50
51			void hmac_set (crypto_ctx * ctx);
52			bool hmac_chk (crypto_ctx * ctx);
53
54			private:
55			static unsigned char hmac_digest[EVP_MAX_MD_SIZE];
56
57			void hmac_gen (crypto_ctx * ctx);
58			};
59
60			struct vpn_packet : hmac_packet
61			{
62			enum ptype
63			{
64			PT_RESET = 0,
65			PT_DATA_UNCOMPRESSED,
66			PT_DATA_COMPRESSED,
67			PT_PING, PT_PONG, // wasting namespace space? ;)
68			PT_AUTH_REQ, // authentification request
69			PT_AUTH_RES, // authentification response
70			PT_CONNECT_REQ, // want other host to contact me
71			PT_CONNECT_INFO, // request connection to some node
72			PT_MAX
73			};
74
75			u8 type;
76			u8 srcdst, src1, dst1;
77
78	pcg	1.5	void set_hdr (ptype type_, unsigned int dst);
79	pcg	1.1
80			unsigned int src () const
81			{
82			return src1 \| ((srcdst >> 4) << 8);
83			}
84
85			unsigned int dst () const
86			{
87			return dst1 \| ((srcdst & 0xf) << 8);
88			}
89
90			ptype typ () const
91			{
92			return (ptype) type;
93			}
94			};
95
96			////////////////////////////////////////////////////////////////////////////////////////
97
98			// a very simple fifo pkt-queue
99			class pkt_queue
100			{
101	pcg	1.8	net_packet *queue[QUEUEDEPTH];
102	pcg	1.1	int i, j;
103
104			public:
105
106	pcg	1.8	void put (net_packet *p);
107			net_packet *get ();
108	pcg	1.1
109			pkt_queue ();
110			~pkt_queue ();
111			};
112
113			struct connection
114			{
115			conf_node *conf;
116			struct vpn *vpn;
117
118			sockinfo si; // the current(!) destination ip to send packets to
119			int retry_cnt;
120
121			tstamp last_activity; // time of last packet received
122
123			u32 oseqno;
124			sliding_window iseqno;
125
126			u8 protocol;
127
128	pcg	1.8	pkt_queue data_queue, vpn_queue;
129	pcg	1.1
130			crypto_ctx octx, ictx;
131
132			enum conf_node::connectmode connectmode;
133			u8 prot_minor; // minor number of other side
134
135	pcg	1.6	void reset_si ();
136			const sockinfo &forward_si (const sockinfo &si) const;
137	pcg	1.1
138			void shutdown ();
139	pcg	1.7	void connection_established ();
140	pcg	1.1	void reset_connection ();
141	pcg	1.7
142	pcg	1.4	void establish_connection_cb (time_watcher &w); time_watcher establish_connection;
143			void rekey_cb (time_watcher &w); time_watcher rekey; // next rekying (actually current reset + reestablishing)
144			void keepalive_cb (time_watcher &w); time_watcher keepalive; // next keepalive probe
145	pcg	1.1
146	pcg	1.7	void send_connect_request (int id);
147	pcg	1.1	void send_auth_request (const sockinfo &si, bool initiate);
148			void send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg);
149			void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols);
150			void send_reset (const sockinfo &dsi);
151			void send_ping (const sockinfo &dsi, u8 pong = 0);
152	pcg	1.9	void send_data_packet (tap_packet *pkt);
153	pcg	1.7
154	pcg	1.1	void inject_data_packet (tap_packet *pkt, bool broadcast = false);
155	pcg	1.6	void inject_vpn_packet (vpn_packet *pkt, int tos = 0); // for forwarding
156	pcg	1.1
157	pcg	1.7	void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = 0);
158	pcg	1.1	void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi);
159
160			void script_node ();
161	pcg	1.3	const char *script_node_up ();
162			const char *script_node_down ();
163	pcg	1.1
164			void dump_status ();
165
166			connection(struct vpn *vpn_);
167			~connection ();
168			};
169
170			#endif
171